Mast-arm



(No Model.) 2 Sheets-Sheet 1.

G. M. KELLER.

MAST ARM.

No. 399,334 Patented Mar. 12, 1889.

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(No Model.)

0. M. KELLER.

MAST ARM.

Patented Mar. 12, 1889.

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UNITED STATES PATENT OFFICE.

C. MARTIN KELLER, OF COLUMBUS, INDIANA.

MAST-ARM.

SPECIFICATION forming part of Letters Patent No. 399,334, dated March 12, 1889.

Application filed March 10, 1888. Serial No. 266,839. (No model.)

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Be it known that I, C. MARTIN KELLER, a citizen of the United States, residing at (T0- lumbus, in the county of Bartholomew and State of Indiana, have invented certain new and useful Improvements in Mast-Arms, of i which the following is a specification.

The object of my said .invention is to prod nee a mast-arm upon which to mount electric liglits, which shall be inexpensive in construction, easily and quickly placed in position, and conveniently operated, and this object] accomplish in the manner hereinafter pzin'ticularly described.

Referring to the accompanying drawings, which are made a part hereof, and on which similar letters of reference indicate similar parts, l igurc l is a top or plan view of a pole or mast and arm with alightmountml thereon embodying my said invention; Fig. 9, a side elevatitm of the san'le, the lamp being let down in position to be adjusted and have new carbons placed tlmrein; Fig. 3, a similar view with the lampraisedin position, as when in use; liig. l, a detail sectional view through the outer end of the arm above the lamp; Fig. 5,a transverse sectional view through the upper end of the brace to the arm; Fig. (i, a longitudinal section of the same, and Fig. 7 a similar section through the lower end. of said brace where it is attached to the mast.

In said drawings, the portion marked A represents the pole or mast; B, the arm; C, the brace to said arm; D, the lamp, and E the rope running from said lamp overthe sheaves in the arm to alongside the mast.

The mast A may be of any ordinary post or pole for supporting the arm and lamp. At its upper end it is provided with a cross-bar, A, to the ends of which stay-wires running from the outer end of the arm are secured. This cross-bar has a truss-rod, a, running around the mast, by which it is very securely held in position. Near the bottom is a pin or hook, a, with which links on the lower end of the rope running to the lamp may engage, thus holding said lamp in elevated position.

The arm B is tubular, being preferably formed of gas-pipe, and carries on its ends housings B and B in which are sheaves b and b which are thereby protected from snow, sleet, and rain, and over which the rope carrying the lamp runs. It is steadied in position by stay-wires B, running from the bolt connwting the parts B and (I back to the ends of the cross-bar A on the mast A. Midway between the point where the wires are attached to this arm and that where they are attached to the ends of the cross-bar a trusslike connection, 13", maybe inserted between said truss-wires and the arm, thus supporting said arm centrally, as shown.

The brace C, like the arm B, is preferably formed of gas-pipe. At its lower end it is mounted in a socket in a plate, C, by which it can be rigidly attached to the side of the mast A. At its upper end itis connected to the arm l; by means of a jointed connection, one member, ll, of which is a sleeve mount-ed upon said arm and. provided with a boss, through which there is a hole for the setscrew If, and the other member of which is an eye, attached to the end of the b ace, prefcrabl y by means of a socket. The sleeve ll on the frame ll is secured by means of the set-screw If, and may thus be adjusted back and forth on said arm, and this has the eiiiect to vary the angle at which said arm is tended from the mast A.

The lamp I) is or may be any ordinary electric lamp or light, and needs no special description. The wires 1) and I) running thereto are of sufficient length, so that it may be swung down freely to the position shown in Fig.

The rope E is connected to the lamp l) and runs over the sheaves I) and b in the housings B and I3 and through the arm B to a point alon side the mast, where there is preferably a weight, E, secured thereto to partly conntm-l'ialance the lamp I), and to the lower end olthis weight, when used, the links care connected. One of these links is passed over the pin or hook a when the lamp is elevated, and may be secured there by passing a padlock or other seen ring device through an eye in. the end of said pin or hook. This rope should be of just sufficient length so that when said link and pin are together the lamp will be elevated in position.

The operation is as follows: The person having the care of the lamps, being provided with the ordinary carbons and tools, and also with a coil of small rope, first unfastens the links dition, detaches his rope which he carries,

and passes on to the next lamp. v

Having thus fully described my said invention, what I claim as new, and desire to secure by Letters Patent, is

v 1. The coi'nbination of the mast A, having a cross-bar, A, the truss-rod a, for securing said cross-bar in position, the arm B, mounted near one end on the top of said mast, as shown, and provided with housings B and B on its ends, in which are j ourualed the sheaves b and b the brace G, secured at one end to the mast and at the other end connected to the adjustable sleeve B on the arm B, the stay-Wires B running from near the forward end of said arm to the ends of the cross-bar A on the mast A, the truss-arms B interposed between said stay-wires and said arm midway of its length, the lamp 1), the rope E,

running from said lamp over the sheaves b and b to alongside the mast, and means for attaching it in position, substantially as set forth.

2. The combination of the mast A, having a cross-bar, A, a truss-rod, a, securing said cross-bar in position, an arm, B, stay-wires B running from a point on said arm to the ends of the cross-bar A, the brace 0, connected at one end to the mast and at the other to the arm, the latter connection of Which is adj ustable, the lamp D, suspended upon the end of the arm, and a rope, E, running from said lamp over sheaves and through said arm to a point alongside the mast, said rope being of just sufficient length thatit will reach to the point where it is to be fastened when said lamp is in elevated position, substantially as set forth.

In witness whereof I have hereunto set my hand and seal, at Indianapolis, Indiana, this 6th day of il'larch, A. D. 1888.

lVitnesses:

C. BRADFORD, F. W. WooD. 

